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Home My WebLink About6 - Information Item, Boulder Reservoir Water Treatment Plant and Water Transmission System ImprovemCITY OP BOULDER WATER RESOURCTS ADVISORY BOARD INPORMATION ITEM M~ETING DATE: Octobei 20, 2003 Diaft daled October ]0, 2003 AG~NDA TITI.E: Update on the Bouldei Reservoir Water Treatment Plant (BRWTP) and Watcr Tiansmission System Improvements PR~PARING DEPARTM~NT: Robert E. Wilhams - Diiectoi of Public Work foc Ut~lities Anne Noble - Ut~lihes Pro~ect Manager Randy Earley - Utilities Pro~ect Managei Bob Harberg - Utilities Project Cooidmator Randy Cii4tenden - Water Treatment Plant Coordinator FISCAL IMPACT: $4,253,000 constructron estimate for BRWTP Near Term Improvements and $2,650,000 for the Phase I Transmission System and Pump Station Impiovements PURPO5E: This memoiandum piovides inform~ttion to the Water Resources Advisoiy Board on Yhe status of improveinents to the BRWTP and water transmission sysLem. EX~CUTIV~ SUMMARY: The criy of Boulder Utilities Division is currenfly m the design phase of improvements to the Boulder Reseivou Watei Tieatment Plant (BRWTP) and water tiansmission system The improvemenis at the BRWTP include Yhe followmg: • mstallahon of two dissolved arr flotation (DAF) thickeners withm Lhe exist~ng flocculatoi- clarifier buildmg to impiove the removal of patdcles m Che water • new residuals lagoons far dewatenng the sohds removed in the tieatment process, which will not be housed mside a buildmg • mstallalion of baffles withm the existing treated watei reseivoir to improve chlorine contacl hme • the addihon of two new pumpe mside the existing fi1Cer Uuildmg to pump watei from the ~reatment plant mlo the drstribueion system The improvements at the BRWTP will enhance thc level of ueatment, as well as mciease the capaciry of the Watei Tieatment Planl Lrom 8 million gallon~ per day (MGD) to 16 MGD. The AG~NDA IT~M # Page 1 mcreased capacrty of the BRWTP w~ll provtde redundancy to the Betasso Watei Treatment Plant to meet wmtei water demands and allow gieater 17exibihly in urihzing the city's water iesources. No new Uuildings will be cons~ructed All of the new equipment will be msCalled withm the existing foot pnnt of the flocculator-claiifier and filtei buildmgs Water transmission system improvements will also be requircd m oidei to move water from thc BRWTP to the westei n part of the city These impiovements are bemg designed and consriucted as a sepaiate project and include• • mstallation of approximately 18,800 hnear feet oP 24-mch watei transmission pipe, modifications at the Cheiiyvale water pump starion, and icplacmg the Tris water pump staUon BACKGROUND: Tbe BRWTP is located east of tbe city of Boulder at 63rd Street and the Diagonal Highway. It was built m 1969 with a nommal trealment capacity of 8 milhon gallons a day Unhl 1994, the plant had primarily been used as a peakmg plant to meet summei water demands. Dutmg 1994 it became necessary to operate the facility on a yeai-iound basis to elimmate staffing and mamtenance pioblems, and to maximize use of the city's iaw water resources. Durmg 1993 a masonry buildmg was constructed to cover the existmg flocculalor-claiifiei and a cover was mstalled over the backwash recovery basm lo facilitate winter operaCions In l 995, the exietmg filter building was modified to house new chemical feed and storage equipment, and two new filters were mstalled The new chemical feed and storage eqmpment were designed for system redundancy and increased storage capacity. The existing chemical building was converted to admmistrative and laboratory space. The facility curienYly has a Lotal of four filCeis. Two additional filteis weie added to provide the ilexibility to operate the plant at a consisCent rate and Yhe ability Yo optimize the treatmcnt processes. Thesc impiovements did not mcicase the hydraultc capacity of the plant Dw mg 2001, the cxisdng chlonne gas dismfecuon system was converled to a Mixed Oxidant System (MIOX) in order lo ehmmate the use of chloime gas. Durmg 2002, the Utihties Division slaff developed perfoimance ob~ectives for the watci ulility These perfoimance ob~ectrves, or goals, were estabhshed to provide: a refeience poml for decisions, quantrtalive measures of progress, a method for priontrzing fulure expenditures, a means Yo measure success and a mcans of communicatmg a umfoim posiGon. Goals weie aetabhshed to meel eommuruty expectalions, piotect public health, piovide enviromnental stewardship, responsibly manage the ciCy's waler resources, provide syslem reliabilily and be fiscally responsible Measures were also established to deteimme the fiequency with wl~ich the Utilrties Division was meetmg the goals that were developed Duimg 2002, utilities staff initialsd a pielimmary design for impiovements to the Bouldei Resexvoit Water Treatment Plant to fur~het analyze and addiess issues ratsed m the Tieated Water Master Plan, as well as LhroLigh the goal sctlmg process. A list of treatment plant conceins was developed based on staff's evaluation of the tieatment facility's abihty to meeL cuirent and fuCure regulaCory iequirements and Yhe mternal water quality goals McGuire Environmental Consultants, Ine. was hired to help evaluate and piiorihze these issues. Bascd on the list of waLer treatment impiovements categoiized by city staff, a iequest Por pioposals AGLNDA ITF.M # Pase Z was developed and MWH (foimeily Montgomeiy Watson Harza) was selected to prepate a predesign ieporl to address these issues. The predesign report was completed in 7une 2003. A cost esCimate for the pioposed improvements, giouped mto near-term, mid-term and long-term, was devcloped, and is mcluded as Attachment A to this memoiandum. The near-teim improvements foeused on improving the level of pictieatn7ent (the tieatmenC process piior ~o filhatton), handlmg residuals diymg on site and mcreasmg the chlonne contact time far bettei dismfection A site plan foi all of the pioposed impiovements is included as Attaehment B The ougmal scope of work at the BRWTP mcluded evaluating ophons foi equalizmg thc flow of iesiduals to lhe WWTP m ordei to mirumize unpacts on lhe WWTP Tn 1991 a sarutaiy sewer connechon to the BRWTP was mstalled lo allow disposal of Yhe Water Plant residuals to the Wastewater Treatment Plant Smce thaC time, the Wastewater Treattnent Plant has been expeiiencmg lreatment pioblems, which is believed to be associated with Lhe disposal of ihe Water Plant residuals. The BRWTP ieceived an mdustrial discharge permit m September 2002. After evaluating the data that was collected for the discharge peimrt, the pioject scope was expanded Yo mclude an evaluation of residuals handlmg alternatives on site This evaluarion was completed m Septembei, with the recommendation bemg made to mcorporate tesiduals diymg lagoons into the fmal design. Dmmg the wmter of 2002-2003, the ciry pilot tested dissolved air flotation (DAF) equipment at the BRWTP in order Co determine thc feasibilrty of this piocess m replacing the exisYmg ilocculalor-clarifier as prelieatment piior to filtration The DAF piocese was found to woik well The pilot testmg effort also served to piequalify manufactuiets for the purchase of this cquipment. A prepiocuiemenl request for pioposals (RFP) was recenlly completed and a Notice of Award has been issued for the purchase of this equipment Construction conhactors will also be prequalified for Yhis pro~ect. Piequalification proposals will be evaluated durmg November, 2003, with the construchon conriact ant~cipated to be bid m Januaiy. As part of the city's goals sellmg process, and m light of lhe reccnt drought, staff discussions also took place regarding the appropiiate tieatnient capacrty of the BRWTP to assure a reliable lieatmenl system. In oider to fully uYihze the crty's available water iights at Lhe BRWTP and provide foi treatmenC plant redundancy lo meet wmLer water demands if the Betasso Water Tieatment Plant was oul of service, it was deteimmed that all future impiovements at the BRWTP would be designed and constructed to meet a fnm tieatment capacriy of 16 milhon galions per day (MGD). Integia Engmeermg completed a Zone 1 Distubution Syslem Analysis m Febiuaiy 2003 to evaluate the distribution of water from the BRWTP given the mereased plant capacity The analysis deteimined that impiovements Co the transmission system and the pump stahons at the BRWTP, Cheiryvale and Iris would be needed m oidei to move watei fiom the BRWTP to the icst of the distiibution eystem. InLegra Enginearmg iecomnlended upgiades that mclude mstallation of appioximately 18,8001inear feet of 24-mch waler transmission pipe and replacmg the Tiis Pump Stahon with a ncw 2 4 MGD pump station and improvements Lo the existing Cheiryvale Pump Stahon Thc pioposed pipelme will follow lhe diagonal highway fiom 63"~ Street into Bouldei near Iris Avenue (see Attachment C) AGRNDA ITEM # Page 3 The liansmission and pump station improvement pro~ect is planned to be phased, wrth The Iris P~~mp Stahon woik and approximately 8,000 to 10,0001mear feet of the pipe mstallaCion takmg place in 2004 This will mcrease f he watei deliveiy capacity to allow greatei flexibiliry m utihzmg the city's water resources. Additional work ~s planned foi later yeais and wili piovide iedundancy to lhe Betasso Watei TreaCment Plant to meet wmtei water demands Phase I will mcrease dehveiy capacrty from 8 MGD to 13 MGD, with phase 1T providmg an mciease fiom 13 MGD to 16 MGD. The cosC of the first phase of ihis pro~ecY is estimated at $2.65 million. A table outlinmg lhe fundmg foi the phase I and phase II tmprovements is shown m AttachmenC D The City of Boulder's udlities division has hired McLaughlm Water Engmeers to provide design seivices for these improvements. The 2002 budget foi the improveinenls at the BRWTP mcluded $300,000 for design of the neai term improvements, with an additional $3.5 million m Lhe 2003 budget and $1 million m the 2004 budget far construction of these impiovements. In addition, $100,000 was mcluded m the 2002 budget for upgrades to the high service pump sCation at the BRWTP and $300,000 will be utilized from the balance m tbe Wastewatei Treatment P1anY Effluent Outfall Relocalton Pro~ect for residuals improvements at the BRWTP. Funding for the near term, as well as the mid-term and long term impiovements at the BRWTP is shown m Attachment D. ANALYSIS: The proposed improvements will reduce Yhe solids loadmg on the filters and mcrease Lhe hydraulic capacriy of the Plant from S MGD to 16 MGD. This will improve the oveiall level of treatment, as well as provide redundancy to the Betasso Water Treatment Plant to meet mdoor watei demands and will grve the city increased flexibiliry m utthzing our waCer resources. PUBLIC COMM~NT AND PROCESS: UtiliYies staff submitted a preapphcation to lhe criy's Plamm~g and DevelopmenCal Services Division m 7une 2003, wbich determmed Yhat an AdmmisY~ative Review for a Mmor Modification to the existing Site Plan would bc requued StaPf will submit the Admmistiative Review once the pieLmmary design has been completed. The CAy is also currently m the procass of prequahfymg coniractois foi this pro~ecl. The prequah&cation process allows the Crty to evaluate contiactois' past performance before select~ng ihem lo participate in Yhe convenYional compeLihve biddmg process. Pre-design analysis for the transmission and pumpmg improvements work is underway The plannmg appioval process will include a Commuruty and Envuonmental Assessment Process (CEAP) and Boulder County 1041 ieview ATTACHMENTS A. Cost Eshmate of Proposed Improvements for the BRWTP B Site Plan of BRWTP Impiovements C. Proposed Alignment for New Water Lme and Location of Iris Pump Statton D Fundmg Table for Tiansmission, Pump Station and BRWTP Impiovements AG~NDA IT~M # Page 4 BRWTP Capital improvement Costs Dio~ude for Preox~dation Near-Term Pro~ect d ~ Long-Tertn Pro7ect Residuals lagoons Residuals lagoons and potential advanced dewatenno svstem ~CoMrol L Flo $1,006,000 $3,037,000 ......,. a_.a,~,.,.~..~_......~.,.,, _ ~, ,,. ~, h~.w,m ~ ,,. ~.,,we., . ~ ~._.~.,,. w W.~. ~ w Costs are for storage and piping only Assumes that gene2tors and - analyzer eqmpment are leased as pad of chbnte procurement package ~ Near-Term Pro~ect - lagoons for approx one-third of residuals pmduction x at 10 MGD average annual flow mte Long-Term Pro~ect - lagoons and/or ` accelereted dewatenng sysiem for all residuals production at 10 MGD ave2ge annual flow 2te e new HMI in ;Reservoir ContactTime Cleanvell Baffhng Inslali flexible memb2ne curtain in Sr eps4nq cleanvell ~ New Reservo~r ~~2,000 ~ ~y ~ -_ "d ~""' ~~ ;,Raw Water Conveyance . . . . Install new 2w water pump ~.~ , . y, , ~rn { $127,000 ~~° '` ~DAF Preheatment ;$2 81q000 $0 51257 000~~ Y ~ Demo existing flocculating clanfier and - '~ ~ - ' Near-Term Pro ect , ) mstall two DAF units, flash mix and ° "° . ~2,S10,OOD a!E Each urut will have a minimum capaciry of 8 mgd Nominal plant capacity wil~ ~ yard pi m modrfications ~ ~ , be 16 mgd, firtn capacrty will be 8 mgd . ~ Long-Term Pm ect _~- Install one additional DAF unrt ~ $1,257,~00= Nominal plant capac will be 20 - 24 m d, frm capaci will be 16 m d 9 '~' ~' ~ , __.____ ~~ ______ _~____ ~_._ . _ 1~ rWasteWashwaterTreatment ~ ~ $0 $829,000 $0~'"A i Sludge Collecnon ____.__ ~ ; µ~ Na ~ Grven the cost of sludge collection, u6lize waste washwatertreatment ~ _ _ Stand-alone structure wdh g2vdy ~ t Potent~ally, lower cost of approz $200,000 for f~rst phase of treatment ~ * plate seHler unrts $829,OD0 ~inshllation, assuming placement of package plate settling unrt in exist~ng ~ 3 Se arate WWN! Treatrnent ;_P retreatment area ~Presedimentation ~~~~~ ~~~~~ $0 $1,376,OOU ~ S0;' ' ~~ 3 Comed remamder of pretreatmeni ~.,- r_ -Utilrzes remainmg space m pretreatment area after allowing for [hree DAF ' basm to conven4onal settling _ $1,076,000 -~treatmenttrams includes baffle curtams, launders and sludge collection = ~ w~~ resedimentation unit ~~equipment ° ~ Install plate settlers in convenhonal $300 000 ~ Incorpo2te plate settlers mto presedimentation unrt to impmve treatment i~ °~ °` + ° ~ presedimentatwnund , ~- ~ ~ ~effic, iency s= 3 ; ~ ~ 'High Sernce Pump ` Install new Mgh service pump p~+ $200,000 F ~ - '' ,"~c ~~ ~, Not cumulative of aIl potential long-term improvements options Includes ph „ =LOng Term Improvements $0 5225,000 $11,540,000 S e ad~ustment, UV disinfection and emergency power 000~ Improbable - wrth exception of T&0 control, oflers no advantage over UV ,. 279 58 Ozone ~ , , ~ disinfection S Most probable pro~ect for long-term control of Cryptospondium Would not : ~~ ~ ~ t $2,745,000 be warzanted rf membrane filtration repiaces granular media ftltration at - , W _ _ __ plant Inc in Lonq-Tertn CIP _~~~~. vM __ : _,__~, ~ ~ ' Emergency Power _,_, _ _ ~ ~400,000~~ Included m Lon -Term CIP ~ . ~ $8,995,000 ., oWarramed rf plant hydrauhcs uhtmately hmit capaaty of granular media , Membranes filters Inc in Lonq-Tertn CIP ~ Replace anth2crte with GAC caps m ~ " -~POtentialT&Ocomrolappmach - $250,000~~ GAC ewstin ranularmediafilters , ~ '' - $225,000 ~~e Used for reduang pH below upper range of target values Additrve ' - ~PH A~ustment System Leased C02 feed system _ ~attemahve rtem for neartertn pr~ect ~' "' ~ Purchase used pilot facdity fmm DAF inanufacturer as pad of BRWTP . ~';PtlotFacdity °'~ i $5Q000 eqwpmentprowrement Ww. funded out of distnbution --------------- ----------- --------- -- ----- MATCH LINE A-A -- --- ---------- --- SEE FIGURE 1B -------- --- - -- ------ --- ----- - ------- ,~ -~ ------ - r ( -- ------- --- ~ a~ry,.,v ~ ~9T~,+q 5 ~PPE ' ADMINISiRATION ~i" - 3 ~ PIITURE T'~K BIIILDING ~cF ' ~~ yw ~ DECANT/FILTRATE '°a ' ~~~ ~ RECYCLE >~ ~ ~~ _~ ~ ID FIRE ~ ~ - _~ ~ .. SPRINKLER ` ~- ~ ~ ~ • i ~ 1 Q _ -. _ ' ~ i ~' :~ ~ FLOCCULATOR/ ~- CLRRIFlER BASW O~B: NODIFIE~) ' ~ I CHNN LINK FEM1CE~i ~ 3 = ~i i ~ i T ~ N w - - _ NEW WASTE WASHWATER ~ ~ ~ A` ° a TREATMENT, PUTUftE . MID-TERM IMPROVEMENT PRESEOIMENTATION ~ ' 3 - - , OPTION ~ BASIN ~ " " F (J ~F T I r + ' l1 t BE i -- ~ CJ' DAF TRNN ` _ NEW METERING ~ " ' Q ~ , VAULT ~ DAF TRPJN I ~ l°ll I ~ ~ nceess I 1 ___ ' O ^ ~ ~ ' _ - '- _ ~m-.- x_xROA9~ _ _ L _ ~ _~~ I ~ ~, ~ 48 RAW WATER ___-_____._.__~___~~_~.,..~..._ _ " _. _ '~ __ _ __ _______ "- _ _ __ _ _ __ ~ c -_- "_ " "- _~~~_-~- c.'....._ ` d _ __ _ _ _ __ _ ___ ___ _ ~~ ¢ ' -- ""____--_-_----- -`__- _ _-' _- -___-__ _- __-___- _ -__ NEW_4H"_FJLTER.EFfLUEP1T _ __-_ - -_ -_- -___ `,.,.~ _____"'__ ~ _"_-______-_--_- _'_ _ "'^ __ =- Y r W~ ~.. ' t _ _ . ~~_v~ ~'_'______ ..E .. ~ > ~ ~ ~ -'~'~~ t : ~ ~ RETROFti MEldBRANES ~ _ '- --- - ~ . 3; j MSIDE EXISTING PILTERS, ~ s LONG-TERM IMPROVEMENT OPTION 1 F~ ~ ° I W ER ~ __ ~ RY ~ R~ FI~TER BUILDING T ^ " ~ ~ BASIN ~ f_ ~ " ' .... - 1 (I k( F ~ ~ e~ 1 HIGri SERVICE I { WATER ~ ~ t , PUMPI'~G ~ESERV01~ - ~- ~ '~ STATIDN *~ °y%' . € ~ .... 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K ~ ~l' x ~` v -. -- ?i ' _ ~. ~,.,.. __ _ 5 /~ i ° N~h ' ~ sc so ~ uo ~` 0' a nwc~ au ~ o ~ ~ ~ Omver caoraeo oarz Q M W H pTY OF BOULDER, COLORCDO BDULDER RESERVOIR WAT R R p ~ awP~ w~ FIG ~¢w a~. ~ E TREqTMENT PROPOSm SLWGE 1AG00N LAYOUT ~~ - ~ wu cmrv o crr .Exs rwu ucEis xo oprE PLPM IMPROVEE~NTS „ h-- - ~ % ' ,~n ; f„ ~~~~,,~- 1°. ~ ~~ ~r/~~ ~~i~ ~ ~ I~~JiJ(D~f`P , ,~3^J, v,,i ~~i /~ i i~~ - ~~' S~!2Mi7fr - -~~, ~''' ~~ iW~~', ~" / b ~, ~i ~ ~~ '~./~ N~~ , L d ~ l ' , ~ ~%i/; // / ~dl i I e .. , ' li ~%%/~~~ / H ` ~I ~~ "`T~, v ji y ~ ~~ 1, ~ jr=<„~ t,~ ,~ ~~~ ~, -~ _ ~ ~ ~- ~,,' ~~' ~ "~ y ~ ~, ,~~ = ~ - ~~ r ~ ~ ~ ~' ~ ~ ,~y i ~~~ -~~ ~ ~ '~- ; ~/ ~ ~ ,i ~~-~ >_~ ~ ~~izi ~~os~n ,~~ ~~i~ ?,~ ~'~ ` ,~ ` AI 1~6NMCN I ~ ~~ ~. „p , `~; ~,; ~ ..~ '~/~ , __- - ,..,~ ~~ _ ~-~' ~ ~ . ` , ,v~ ~-~ i ~ I I ~ ~ ~ ' ~~ ~ i, i i ~i ~. ~ " ~~ Y ( ~i a ~ s!-' ~~~%.'"~._ea~2iJ~L~k.,~~r,r=tjnl~tn~Ni - ~~ r~uMi~ SinuuN r`tn{ryxisTirt~s- ~. iRis ? z~ia NuMi~ Sia~~nSN ~hzE' ~ l PUMI' ~I f ' enxe.xa .o , y ~ 1 / S1A7I~J~~~ . -~~~~ ~ ~..> ~~ ,~~% .~,~ `~ /a~ ~ ~~ , F~ i ~~I'~+£~~y~``,~~%~ ~I~ ~O~ ~~~e jh. ,~ 4~I ~ ~ ~I~i~~fiYV~l.~l i ~~~ ~ -~/ I 1 ~ li ryi~1`~ I I~~ Sj~l`~~I"4^il~i i a_L~3~* -. 1„ ~ Wll I~K I I~ANSMiSSI IJN ~~~Y °F R°u'd~~SYSTEM IMPR~VEMEM~ SEE (1 1 I (1CHEMENT C I ~Attachment D ~ ~ ~ FUNDING FOR TRANSMISSION AND PUMP STAI ION IMPROVEMENTS I ' ' Transmission Pump Stations Cash BRWTP BRWTP Pump Station WWTP Effluent Line' i 2002I 2003 2004 2005I 2006 2007 20081 2009I $100,000i $2,000,000 j I I $2,OOQOOOI, $~50,000~ $400,OOOI I $500,OOOi ~ i I I I ~FUNDING FOR BR ~ ~ 2002 2003 $300,000 $3,500,000 I $100,000 ~I I il * Savings WTP IMPROVEMENTS - Near Term, Mid-Term and Long Term ' I I i I 2ooa~~ 2oos~ zoos~ 200~ 2oos ~ ~ ~ $1,050,000~ $1,000,000~ i I $2,000,000 i I i i $6,30Q000; I ~ ~ Wastewater Treatment Plant Outfall Relocation Pro~ect 2009~ $12,000,000 I